A current-limiting valve of an electronically controlled high-pressure common rail system and an electronically controlled high-pressure common rail system

Abstract

The application provides a current-limiting valve of an electric control high-pressure common rail system and the electric control high-pressure common rail system, and relates to the technical field of the electric control high-pressure common rail system, and solves the technical problem that there is no current-limiting device, and the other common rail system cannot be protected from being affected when one of the electric control high-pressure common rail systems fails. The current-limiting valve of the electric control high-pressure common rail system comprises a current-limiting valve body, a joint body and a current-limiting assembly. When two electric control high-pressure common rail systems normally operate, the current-limiting assembly is in a communication state, so as to ensure that the fuel of the two electric control high-pressure common rail systems flows to each other, and to ensure that the rail pressures at both ends are balanced. When one of the electric control high-pressure common rail systems fails, the current-limiting assembly is in a current-limiting state, so as to block the fault side and realize current limiting. The application is connected in series in the oil path of the communication of the two common rail systems. When one of the electric control high-pressure common rail systems fails, the fuel flowing through the two common rail systems is cut off in time, and the other common rail system can normally operate without being affected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric control high pressure common rail system, in particular to a current limiting valve of electric control high pressure common rail system and electric control high pressure common rail system. BACKGROUND

[0002] With the increasingly stringent emission regulations, diesel engine manufacturers are actively developing new products to reduce diesel emissions. In recent years, electric control high pressure common rail fuel injection technology has a good application prospect. However, compared with traditional mechanical fuel injection pump diesel engines, diesel engines using electric control high pressure common rail fuel injection system are always under high pressure fuel during operation, and their reliability and safety are relatively low. Therefore, protective measures need to be considered to improve reliability and ensure that when a cylinder electric fuel injector is abnormal or other faults occur, the flow can be limited in time to avoid causing engine out of control and causing harm to equipment and personnel; At the same time, the reliability margin of the electric control high pressure common rail system is improved to ensure that when one column of common rail system fails, the other column can still maintain the normal operation of the diesel engine at partial power.

[0003] There is an urgent need for a current limiting valve of electric control high pressure common rail system, which helps to solve the lack of current limiting valve structure in the prior art, so that when one column of electric control high pressure common rail system fails, the fuel flowing in the high pressure oil pipe connecting the two columns of common rail system can be cut off in time, protecting the other column of common rail system from being affected and still running. SUMMARY

[0004] The purpose of the present application is to provide a current limiting valve of electric control high pressure common rail system and electric control high pressure common rail system to solve the technical problem that there is no current limiting device in the prior art, which cannot guarantee that when one column of electric control high pressure common rail system fails, the other column of common rail system is not affected.

[0005] To achieve the above purpose, the present application provides the following technical solutions:

[0006] The current limiting valve of electric control high pressure common rail system provided by the present application comprises a current limiting valve body, a joint body and a current limiting assembly.

[0007] The current limiting valve body has a through inner cavity for high pressure fuel flow;

[0008] The joint body is provided with a through oil passage, and is respectively installed at both ends of the current limiting valve body, so that both ends of the through inner cavity are respectively communicated with the outside through the oil passage;

[0009] Two joint bodies are respectively connected with two columns of common rail pipes of the electric control high pressure common rail system;

[0010] The flow limiting assembly is arranged between the through inner cavity and the oil passage and has a communication state and a flow limiting state;

[0011] When the two rows of electrically controlled high-pressure common rail systems are normally operated, the flow limiting assembly is in the communication state to ensure that the fuels of the two rows of electrically controlled high-pressure common rail systems flow into each other and the rail pressures at two ends are balanced; when one of the two rows of electrically controlled high-pressure common rail systems fails, the flow limiting assembly is in the flow limiting state to block the failed side and realize flow limiting.

[0012] Further, the flow limiting valve body is provided with a connecting cavity at two ends, the connecting cavity is provided with a threaded section, and the joint body is inserted into the connecting cavity and connected with the flow limiting valve body through threads.

[0013] Further, the joint body is provided with a hexagonal column section structure away from the flow limiting valve body.

[0014] Further, the flow limiting assembly comprises a high-pressure spring, a steel ball, an inner tapered surface of the flow limiting valve body and an inner tapered surface of the joint body.

[0015] The high-pressure spring is arranged in the through inner cavity.

[0016] The number of the steel balls is two, and the steel balls are respectively arranged at two ends of the high-pressure spring.

[0017] The number of the inner tapered surfaces of the flow limiting valve body is two, and the inner tapered surfaces are arranged in the through inner cavity in a spaced manner.

[0018] The inner tapered surface of the joint body is arranged at one end of the oil passage facing the steel ball.

[0019] The two steel balls are connected with the inner tapered surface of the joint body in a ball-tapered sealing manner.

[0020] Further, the joint body is further provided with a joint body inner oil hole, and the joint body inner oil hole is respectively located at two ends of the steel ball to make the high-pressure fuel in the through inner cavity communicated with the oil passage after bypassing the steel ball.

[0021] Further, the number of the joint body inner oil holes is several, and the joint body inner oil holes are uniformly arranged along a circumferential direction of the oil passage.

[0022] Further, the joint body is provided with a ball-tapered sealing hole away from the flow limiting assembly, and the ball-tapered sealing hole is communicated with the oil passage.

[0023] Further, an outer surface of the flow limiting valve body is sequentially provided with a cylindrical first connecting section, a hexagonal clamping section and a cylindrical second connecting section, and the first connecting section and the second connecting section are provided with outer threaded sections.

[0024] The application provides an electric control high-pressure common rail system, which comprises two common rail pipes and a flow limiting valve.

[0025] Further, the system further comprises injectors and high-pressure oil pumps, wherein a plurality of the injectors are arranged on each common rail pipe, and the number of the high-pressure oil pumps is two, and each high-pressure oil pump is connected with each common rail pipe through a pipeline.

[0026] The application provides a flow limiting valve of an electric control high-pressure common rail system, which is installed between two electric control high-pressure common rail systems, under normal conditions, a high-pressure spring and steel balls at two ends are in a static position, fuel at two ends of the flow limiting valve can flow through oil holes in a joint body on the joint body, so that the rail pressure at the two ends is balanced, however, when one end is blocked or a device fails, pressure difference occurs between the two ends, the steel ball at the end with high pressure moves to the other end in the flow limiting valve body against the high-pressure spring, the steel ball at the end with high pressure is sealed with a conical surface in the flow limiting valve body, so that the flow limiting effect is achieved, and the problem that there is no flow limiting valve structure in the prior art is solved, so that when one of the electric control high-pressure common rail systems fails, the fuel circulating between the two common rail systems can be timely cut off, and the other common rail system can still operate. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative effort based on these drawings.

[0028] Figure 1 is a three-dimensional structure schematic diagram of a flow limiting valve of an electric control high-pressure common rail system in an embodiment of the application;

[0029] Figure 2 is a cross-sectional structure schematic diagram of a flow limiting valve of an electric control high-pressure common rail system in an embodiment of the application;

[0030] Figure 3 is an explosion structure schematic diagram of a flow limiting valve of an electric control high-pressure common rail system in an embodiment of the application;

[0031] Figure 4 is a three-dimensional assembly schematic diagram of an electric control high-pressure common rail system in an embodiment of the application;

[0032] Figure 5 is an architecture schematic diagram of an electric control high-pressure common rail system in an embodiment of the application.

[0033] In the diagram: 1. Flow restrictor valve; 2. Connector body; 21. Hexagonal column structure; 22. Oil passage; 23. Oil hole inside the connector body; 24. Conical surface inside the connector body; 3. Steel ball; 4. High-pressure spring; 5. Flow restrictor valve body; 51. Through-hole; 52. Conical surface inside the flow restrictor valve body; 6. Electrically controlled high-pressure common rail system; 61. Common rail pipe; 62. Injector; 63. High-pressure oil pump. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0035] like Figures 1-3 As shown, the present invention provides a flow limiting valve 1 for an electrically controlled high-voltage common rail system 6, comprising a flow limiting valve body 5, a connector body 2, and a flow limiting assembly; wherein:

[0036] The flow-limiting valve body 5 has a through-cavity 51 for high-pressure fuel flow;

[0037] The connector body 2 is provided with a through oil passage 22, and is respectively sealed and installed at both ends of the flow limiting valve body 5 so that both ends of the through inner cavity 51 are connected to the outside through the oil passage 22.

[0038] The two connector bodies 2 are respectively connected to the two common rail pipes 61 of the electrically controlled high-voltage common rail system 6;

[0039] The flow limiting component is located between the through cavity 51 and the oil passage 22, and has both a connected state and a flow limiting state. When the flow limiting component is in the connected state, the through cavity 51 and the oil passage 22 are connected, and the fuel is interconnected between the two common rail pipes 61. When the flow limiting component is in the flow limiting state, the through cavity 51 and the oil passage 22 are disconnected, and the fuel is not interconnected between the two common rail pipes 61.

[0040] When both electronically controlled high-pressure common rail systems 6 are operating normally, the flow limiting components are in a connected state to ensure that fuel flows between the two electronically controlled high-pressure common rail systems 6 and to ensure that the rail pressure at both ends remains balanced; when one of the electronically controlled high-pressure common rail systems 6 malfunctions, the flow limiting components are in a flow limiting state to block the faulty side and achieve flow limiting.

[0041] Specifically, in this embodiment, the connection and flow restriction state switching of the flow restriction component depends on the pressure difference of the fuel in the two electronically controlled high-pressure common rail systems 6. Under the action of the pressure difference, the flow restriction component switches from the connection state to the flow restriction state.

[0042] Furthermore, such asFigure 2 As shown, the flow limiting valve body 5 is provided with a connecting cavity at both ends, and a threaded section is arranged in the connecting cavity. The joint body 2 is inserted into the connecting cavity and connected with the flow limiting valve body 5 through the thread.

[0043] It should be noted that the diameter of the connecting cavity is greater than the diameter of the through inner cavity 51.

[0044] Further, in order to facilitate installation and tool clamping, as shown in Figure 1 and Figure 2 As shown, a hexagonal column section structure 21 is arranged at the end of the joint body 2 away from the flow limiting valve body 5, which is convenient for tool fitting.

[0045] When the joint body 2 is screwed into the connecting cavity of the flow limiting valve body 5, the hexagonal column section structure 21 is located at the end of the flow limiting valve body 5.

[0046] Further, as shown in Figure 2 and Figure 3 The flow limiting assembly includes a high-pressure spring 4, a steel ball 3, an inner tapered surface 52 of the flow limiting valve body, and an inner tapered surface 24 of the joint body; wherein:

[0047] The high-pressure spring 4 is arranged in the through inner cavity 51. Under normal circumstances, the high-pressure spring 4 and the steel balls 3 at both ends are in a static position. It should be noted that the length of the through inner cavity 51 is substantially equal to the natural length of the high-pressure spring 4 when it is not stressed, or the length of the through inner cavity 51 is slightly less than the natural length of the high-pressure spring 4 when it is not stressed.

[0048] The number of steel balls 3 is two, which are respectively arranged at both ends of the high-pressure spring 4.

[0049] In order to seal and limit the flow when the steel ball 3 moves after being stressed, in the embodiment, the number of inner tapered surfaces 52 of the flow limiting valve body is two, which are arranged in the through inner cavity 51 to respectively seal and limit the flow of the two steel balls 3 after moving.

[0050] In order to limit the steel ball 3, the inner tapered surface 24 of the joint body is arranged at the end of the oil passage 22 facing the steel ball 3.

[0051] The two steel balls 3 are connected with the inner tapered surface 24 of the joint body in a spherical tapered sealing manner. The spherical tapered sealing is formed between the inner tapered surface 24 of the joint body and the steel ball 3, so as to limit the steel ball 3 and the high-pressure spring 4.

[0052] Further, since the steel ball 3 is in spherical taper sealing with the inner taper surface 24 of the joint body, and in order to ensure that fuel can flow into the oil passage 22 through the through inner cavity 51, in the embodiment, the joint body inner oil hole 23 is arranged on the inner wall of the oil passage 22, that is, in the joint body 2. In normal operation, fuel flows into the oil passage 22 through the joint body inner oil hole 23, and then flows into the through inner cavity 51, and then flows into the oil passage 22 on the other side through the joint body inner oil hole 23 on the other side, and finally flows out. The joint body inner oil hole 23 is located at both ends of the steel ball 3, so that the high-pressure fuel in the through inner cavity 51 communicates with the oil passage 22 after bypassing the steel ball 3.

[0053] It should be noted that the joint body inner oil hole 23 is located at both ends of the steel ball, that is, at the left and right ends of the limit position of the steel ball 3 after the spherical taper sealing with the inner taper surface 24 of the joint body. Through such a structure, when the steel ball 3 is in a balanced state, fuel can flow normally.

[0054] Further, the joint body inner oil hole 23 is arranged in a plurality of numbers and uniformly arranged along the circumferential direction of the oil passage 22.

[0055] Further, the joint body 2 is provided with a spherical taper sealing hole at the end away from the flow limiting assembly; the spherical taper sealing hole communicates with the oil passage 22, and the spherical taper sealing hole is used for forming spherical taper sealing with the high-pressure oil pipe.

[0056] It should be noted that the joint structure of the high-pressure oil pipe is a prior art, and the present application does not improve this part, so it will not be described in detail.

[0057] Further, the outer surface of the flow limiting valve body 5 is sequentially provided with a cylindrical first connecting section, a hexagonal clamping section and a cylindrical second connecting section; the first connecting section and the second connecting section are provided with an external thread section, which is screwed with the internal thread connecting sleeve part of the high-pressure oil pipe, and the inner core part of the joint of the high-pressure oil pipe is connected with the spherical taper sealing hole.

[0058] In use, the flow limiting valve is installed between two rows of common rail pipes and is fixed by two high-pressure oil pipes. The spherical taper sealing structure is adopted between the high-pressure oil pipes and the joint body, the roughness of the spherical taper sealing hole in the joint body is Ra0.4, which ensures the sealing property in use, and the first connecting section and the second connecting section of the flow limiting valve body are connected with the high-pressure oil pipe (the pipe end has a joint) through threads.

[0059] In the embodiment, the specific structure of the flow limiting valve of the electric control high-pressure common rail system is provided, the joint bodies 2 at two ends are used for being connected in the pipeline, under normal circumstances, the high-pressure spring 4 and the steel balls 3 at two ends are in the static position, the fuel at two ends of the flow limiting valve 1 can flow to each other through the joint body inner oil holes 23 on the joint bodies 2, the balance of the rail pressure at two ends is ensured, but when one end is blocked or the equipment fails, the pressure difference appears between the pressures at two ends, the steel ball 3 at the high-pressure end moves to the other end in the flow limiting valve body 5 by pressing the high-pressure spring 4, the steel ball 3 at the high-pressure end is sealed with the conical surface 52 in the flow limiting valve body to achieve the effect of blocking and limiting the flow, the high-pressure spring 4 has a certain force on the pressure generated by the pressure difference, only when the pressure difference reaches a certain degree and is greater than the force, the steel ball 3 can move in the through inner cavity 51 by pressing the high-pressure spring 4, according to the change of the pressure, the steel ball 3 and the conical surface 52 in the flow limiting valve body realize the flow limiting through the ball-cone sealing, which helps to solve the problem that there is no flow limiting valve structure in the prior art, and ensures that when one of the electric control high-pressure common rail systems fails, the fuel circulating between the two common rail systems can be cut off in time, the other common rail system is protected and can still operate normally.

[0060] As shown in Figure 4 and Figure 5 , the electric control high-pressure common rail system 6 provided by the application comprises left and right common rail pipes 61 and a flow limiting valve 1, wherein the flow limiting valve 1 is connected with the left and right common rail pipes 61 through high-pressure oil pipes at two ends. It should be noted that the number of oil outlets on the common rail pipe 61 can be adjusted and is not limited.

[0061] Further, the electric control high-pressure common rail system 6 further comprises an oil injector 62 and a high-pressure oil pump 63, wherein a plurality of oil injectors 62 are arranged on each common rail pipe 61, and it should be noted that the number of oil injectors 62 can be adjusted and is not limited; the number of high-pressure oil pumps 63 is two, and each high-pressure oil pump 63 is connected with each common rail pipe 61 through a pipeline.

[0062] The flow limiting valve 1 of the electric control high-pressure common rail system 6 provided by the application is installed between the left and right electric control high-pressure common rail systems 6, under normal circumstances, the high-pressure spring 4 and the steel balls 3 at two ends are in the static position, the fuel at two ends of the flow limiting valve 1 can flow to each other through the joint body inner oil holes 23 on the joint bodies 2, the balance of the rail pressure at two ends is ensured, but when one end is blocked or the equipment fails, the pressure difference appears between the pressures at two ends, the steel ball 3 at the high-pressure end moves to the other end in the flow limiting valve body 5 by pressing the high-pressure spring 4, the steel ball 3 at the high-pressure end is sealed with the conical surface 52 in the flow limiting valve body to achieve the effect of blocking and limiting the flow, which helps to solve the problem that there is no flow limiting valve 1 structure in the prior art, and ensures that when one of the electric control high-pressure common rail systems 6 fails, the fuel circulating between the two common rail systems can be cut off in time, the other common rail system is protected and can still operate.

[0063] First of all, it needs to be explained here that "inward" is the direction towards the center of the accommodation space, and "outward" is the direction away from the center of the accommodation space.

[0064] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0065] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0066] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0067] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0068] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples, without contradiction.

[0069] The above description is merely a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A flow limiting valve for an electronically controlled high pressure common rail system, characterized in that, The application relates to a flow-limiting valve body, a joint body and a flow-limiting assembly. The flow-limiting valve body is internally provided with a through inner cavity for high-pressure fuel flow; The joint body is internally provided with a through oil passage, and is mounted at two ends of the flow-limiting valve body so that the two ends of the through inner cavity are communicated with the outside through the oil passage; Two joint bodies are connected with two common rail pipes of an electrically-controlled high-pressure common rail system. The flow-limiting assembly is arranged between the through inner cavity and the oil passage, and has a communication state and a flow-limiting state. When the two electrically-controlled high-pressure common rail systems normally operate, the flow-limiting assembly is in the communication state, so that the fuel of the two electrically-controlled high-pressure common rail systems can flow into each other, and the rail pressures at the two ends are balanced; when one of the electrically-controlled high-pressure common rail systems fails, the flow-limiting assembly is in the flow-limiting state, so that the failed side is blocked to realize flow limitation.

2. The current limiting valve of an electronically controlled high pressure common rail system according to claim 1, characterized by, The two ends of the flow-limiting valve body are provided with connecting cavities, the connecting cavities are internally provided with threaded sections, the joint bodies are inserted into the connecting cavities, and the joint bodies are connected with the flow-limiting valve body through threads.

3. The flow limiting valve for an electronically controlled high pressure common rail system according to claim 1, characterized by, The end, away from the flow-limiting valve body, of the joint body is provided with a hexagonal column section structure.

4. The current limiting valve of an electronically controlled high pressure common rail system according to claim 1, wherein The flow-limiting assembly comprises a high-pressure spring, a steel ball, an inner tapered surface of the flow-limiting valve body and an inner tapered surface of the joint body. The high-pressure spring is arranged in the through inner cavity. The number of the steel balls is two, and the steel balls are arranged at two ends of the high-pressure spring. The number of the inner tapered surfaces of the flow-limiting valve body is two, and the inner tapered surfaces are arranged in the through inner cavity. The inner tapered surface of the joint body is arranged at one end of the oil passage, which faces the steel ball. The two steel balls are connected with the inner tapered surface of the joint body in a ball-tapered sealing mode.

5. The current limiting valve of an electronically controlled high pressure common rail system according to claim 4, characterized by, The joint body is internally provided with joint-body inner oil holes; the two ends of the joint-body inner oil holes are located at the two ends of the steel balls, so that the high-pressure fuel in the through inner cavity is communicated with the oil passage after bypassing the steel balls.

6. The current limiting valve of an electronically controlled high pressure common rail system according to claim 5, wherein The number of the joint-body inner oil holes is several, and the joint-body inner oil holes are uniformly arranged along the circumferential direction of the oil passage.

7. The flow limiting valve for an electronically controlled high pressure common rail system according to claim 1, characterized by, The end, away from the flow-limiting assembly, of the joint body is provided with a ball-tapered sealing hole; the ball-tapered sealing hole is communicated with the oil passage.

8. The flow limiting valve for an electronically controlled high pressure common rail system according to claim 1, characterized by, The outer surface of the flow-limiting valve body is sequentially provided with a cylindrical first connecting section, a hexagonal clamping section and a cylindrical second connecting section; the first connecting section and the second connecting section are provided with external threaded sections.

9. An electronically controlled high pressure common rail system characterized by comprising: The application also relates to two common rail pipes and the flow-limiting valve.

10. The electronically controlled high pressure common rail system of claim 9, wherein, The application also relates to an oil injector and a high-pressure oil pump; a plurality of oil injectors are arranged on each common rail pipe; the number of the high-pressure oil pumps is two, and each high-pressure oil pump is connected with each common rail pipe through a pipeline.

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